PAPR Reduction Based on Improved VCS Scheme in MC-CDMA System

High peak-to-average power ratio (PAPR) is one of the main drawbacks of MC-CDMA system. Among current methods that aim at reducing PAPR, partial transmit sequence (PTS) and variable code sets (VCS) are the kind of schemes that can improve PAPR statistics effectively but with large search complexity. To overcome this disadvantage, in this paper, we investigate a PAPR reduction scheme which employs recursion algorithm to decrease the computational complexity and a cyclical-shift technique to reduce the signals´ PAPR effectively. Theoretical analysis and simulation results show that the proposed scheme can achieve better PAPR reduction performance than VCS but with lower computational complexity.